无机前驱物多元醇合成SmCo纳米磁性颗粒

Monodispersed magnetic SmCo nanoparticles have been prepared by polyol synthesis using non-toxic inorganic precursors (nitrates). The effect of acetic acid (CH3COOH) and poly vinyl pyrrolidone (PVP) on the formation of SmCo nanoparticles is studied in this paper. The results indicate that the appropriate acetic acid was added to the reaction solution, which decreased the reduction velocity of Co2+ and stability of Sm3+. So the SmCo nanoparticles were synthesized in-situ. However, the overdose of CH3COOH will result in the emergence of CoC2 phase and decrease the coercivity of the resultants. The additive of PVP not only is a dispersing agent, but can coat the centrifugated nanoparticles and prevent them from oxidating in the next using and analysis. The SmCo nanoparticles with a size of 5-8 nm have the ferromagnetic properties of high coercivity (>1000 Oe).